Adding example code to docs

[okwme]

Seems like it should be possible for typedoc to do this automatically but doesn't seem to be a supported feature. I see there's also a command for including examples in JSDoc format but typedoc doesn't support it. Instead they suggest including as code snippets, which sounds like it would also work (TypeStrong/typedoc#135).

Just think it would be nice for example on the tx page to see all of the types actually constructed together once as an example of the object. I find it a lot easier to confirm what you're doing is correct if you're able to just compare the results.

[okwme]

Might also make it easier to link main cosmos docs to sig docs in support of a better description of how transactions and messages are constructed (cosmos/cosmos-sdk#4705)